Why is the current of the motor with load higher than that without load in the high-voltage soft starter cabinet?
Because of this, people began to use their brains to solve this problem and invented soft start. Soft start, as the name suggests, means not starting directly, but starting slowly and gradually. For example, gradually adjusting the input of the motor
The voltage rises from 0 to the rated voltage, and the frequency gradually changes from 0 to the rated frequency. In this way, the starting current of the motor during the starting process changes from the uncontrollable overload surge current in the past to a controllable current that can be adjusted as needed
Small starting current. The entire process of motor start-up does not involve any impact torque, but rather operates smoothly. This is the so-called soft start of an electric motor.
There are two methods for soft start nowadays, one is to use a specialized soft starter to achieve soft start; One method is to use a frequency converter to control and achieve soft start. The traditional soft start method is rarely used anymore. I won't elaborate here. Soft starters and frequency converters are two completely different products for different purposes. The frequency converter is used in places where speed regulation is required, and its output not only changes the voltage but also changes the frequency at the same time; A soft starter is actually a voltage regulator used for motor starting, where the output only changes the voltage and not the frequency. The frequency converter has all the functions of a soft starter, but its price is much higher and its structure is much more complex than a soft starter.
